I just purchased and assembled 15' x 48' intex metal frame pool and when I was filling it, i noticed that there was water laying on top of ground cloth after about 3 hours of filling. The level does not look like it is dropping at all but the wetness is still there. Could I have a seam leaking and what should I do. The pool is over half full. The pool was brand new in box until yesterday and was purchased about 3 weeks ago. Any suggestions would be greatly appreciated.